Abstract
A NUMBER of isomeric long-chain ketones have been prepared and specially purified, in the course of investigations on the solid-liquid transition in long-chain compounds1. As will be clear from the diagram for the ketones CnH2n + 1COC(16+n)H33−2n, the setting points depend in a remarkable way on the position of the CO dipole in the long-chain molecule. The maximum difference (between C8H17COC8H17 and C5H11COC11H23) of 9.2° may be compared with the difference in setting points between C5H11COC11H23 (s.p. 40.8°) and the corresponding paraffin C17H36 (s.p. 21.6°).
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References
Ubbelohde, A. R., Trans. Far. Soc., 34, 282 (1938).
Shearer, G., Proc. Roy. Soc., A, 108, 655 (1925).
Müller, A., Helv. phys. Acta, 9, 626 (1936).
Müller, A., Proc. Roy. Soc., A, 158, 403 (1937).
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UBBELOHDE, A., OLDHAM, J. Melting and Structure of Long-Chain Ketones. Nature 142, 74–75 (1938). https://doi.org/10.1038/142074b0
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DOI: https://doi.org/10.1038/142074b0
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